1 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
2 | /****************************************************************************** |
3 | * |
4 | * Module Name: psargs - Parse AML opcode arguments |
5 | * |
6 | * Copyright (C) 2000 - 2023, Intel Corp. |
7 | * |
8 | *****************************************************************************/ |
9 | |
10 | #include <acpi/acpi.h> |
11 | #include "accommon.h" |
12 | #include "acparser.h" |
13 | #include "amlcode.h" |
14 | #include "acnamesp.h" |
15 | #include "acdispat.h" |
16 | #include "acconvert.h" |
17 | |
18 | #define _COMPONENT ACPI_PARSER |
19 | ACPI_MODULE_NAME("psargs" ) |
20 | |
21 | /* Local prototypes */ |
22 | static u32 |
23 | acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state); |
24 | |
25 | static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state |
26 | *parser_state); |
27 | |
28 | /******************************************************************************* |
29 | * |
30 | * FUNCTION: acpi_ps_get_next_package_length |
31 | * |
32 | * PARAMETERS: parser_state - Current parser state object |
33 | * |
34 | * RETURN: Decoded package length. On completion, the AML pointer points |
35 | * past the length byte or bytes. |
36 | * |
37 | * DESCRIPTION: Decode and return a package length field. |
38 | * Note: Largest package length is 28 bits, from ACPI specification |
39 | * |
40 | ******************************************************************************/ |
41 | |
42 | static u32 |
43 | acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state) |
44 | { |
45 | u8 *aml = parser_state->aml; |
46 | u32 package_length = 0; |
47 | u32 byte_count; |
48 | u8 byte_zero_mask = 0x3F; /* Default [0:5] */ |
49 | |
50 | ACPI_FUNCTION_TRACE(ps_get_next_package_length); |
51 | |
52 | /* |
53 | * Byte 0 bits [6:7] contain the number of additional bytes |
54 | * used to encode the package length, either 0,1,2, or 3 |
55 | */ |
56 | byte_count = (aml[0] >> 6); |
57 | parser_state->aml += ((acpi_size)byte_count + 1); |
58 | |
59 | /* Get bytes 3, 2, 1 as needed */ |
60 | |
61 | while (byte_count) { |
62 | /* |
63 | * Final bit positions for the package length bytes: |
64 | * Byte3->[20:27] |
65 | * Byte2->[12:19] |
66 | * Byte1->[04:11] |
67 | * Byte0->[00:03] |
68 | */ |
69 | package_length |= (aml[byte_count] << ((byte_count << 3) - 4)); |
70 | |
71 | byte_zero_mask = 0x0F; /* Use bits [0:3] of byte 0 */ |
72 | byte_count--; |
73 | } |
74 | |
75 | /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */ |
76 | |
77 | package_length |= (aml[0] & byte_zero_mask); |
78 | return_UINT32(package_length); |
79 | } |
80 | |
81 | /******************************************************************************* |
82 | * |
83 | * FUNCTION: acpi_ps_get_next_package_end |
84 | * |
85 | * PARAMETERS: parser_state - Current parser state object |
86 | * |
87 | * RETURN: Pointer to end-of-package +1 |
88 | * |
89 | * DESCRIPTION: Get next package length and return a pointer past the end of |
90 | * the package. Consumes the package length field |
91 | * |
92 | ******************************************************************************/ |
93 | |
94 | u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state) |
95 | { |
96 | u8 *start = parser_state->aml; |
97 | u32 package_length; |
98 | |
99 | ACPI_FUNCTION_TRACE(ps_get_next_package_end); |
100 | |
101 | /* Function below updates parser_state->Aml */ |
102 | |
103 | package_length = acpi_ps_get_next_package_length(parser_state); |
104 | |
105 | return_PTR(start + package_length); /* end of package */ |
106 | } |
107 | |
108 | /******************************************************************************* |
109 | * |
110 | * FUNCTION: acpi_ps_get_next_namestring |
111 | * |
112 | * PARAMETERS: parser_state - Current parser state object |
113 | * |
114 | * RETURN: Pointer to the start of the name string (pointer points into |
115 | * the AML. |
116 | * |
117 | * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name |
118 | * prefix characters. Set parser state to point past the string. |
119 | * (Name is consumed from the AML.) |
120 | * |
121 | ******************************************************************************/ |
122 | |
123 | char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state) |
124 | { |
125 | u8 *start = parser_state->aml; |
126 | u8 *end = parser_state->aml; |
127 | |
128 | ACPI_FUNCTION_TRACE(ps_get_next_namestring); |
129 | |
130 | /* Point past any namestring prefix characters (backslash or carat) */ |
131 | |
132 | while (ACPI_IS_ROOT_PREFIX(*end) || ACPI_IS_PARENT_PREFIX(*end)) { |
133 | end++; |
134 | } |
135 | |
136 | /* Decode the path prefix character */ |
137 | |
138 | switch (*end) { |
139 | case 0: |
140 | |
141 | /* null_name */ |
142 | |
143 | if (end == start) { |
144 | start = NULL; |
145 | } |
146 | end++; |
147 | break; |
148 | |
149 | case AML_DUAL_NAME_PREFIX: |
150 | |
151 | /* Two name segments */ |
152 | |
153 | end += 1 + (2 * ACPI_NAMESEG_SIZE); |
154 | break; |
155 | |
156 | case AML_MULTI_NAME_PREFIX: |
157 | |
158 | /* Multiple name segments, 4 chars each, count in next byte */ |
159 | |
160 | end += 2 + (*(end + 1) * ACPI_NAMESEG_SIZE); |
161 | break; |
162 | |
163 | default: |
164 | |
165 | /* Single name segment */ |
166 | |
167 | end += ACPI_NAMESEG_SIZE; |
168 | break; |
169 | } |
170 | |
171 | parser_state->aml = end; |
172 | return_PTR((char *)start); |
173 | } |
174 | |
175 | /******************************************************************************* |
176 | * |
177 | * FUNCTION: acpi_ps_get_next_namepath |
178 | * |
179 | * PARAMETERS: parser_state - Current parser state object |
180 | * arg - Where the namepath will be stored |
181 | * arg_count - If the namepath points to a control method |
182 | * the method's argument is returned here. |
183 | * possible_method_call - Whether the namepath can possibly be the |
184 | * start of a method call |
185 | * |
186 | * RETURN: Status |
187 | * |
188 | * DESCRIPTION: Get next name (if method call, return # of required args). |
189 | * Names are looked up in the internal namespace to determine |
190 | * if the name represents a control method. If a method |
191 | * is found, the number of arguments to the method is returned. |
192 | * This information is critical for parsing to continue correctly. |
193 | * |
194 | ******************************************************************************/ |
195 | |
196 | acpi_status |
197 | acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state, |
198 | struct acpi_parse_state *parser_state, |
199 | union acpi_parse_object *arg, u8 possible_method_call) |
200 | { |
201 | acpi_status status; |
202 | char *path; |
203 | union acpi_parse_object *name_op; |
204 | union acpi_operand_object *method_desc; |
205 | struct acpi_namespace_node *node; |
206 | u8 *start = parser_state->aml; |
207 | |
208 | ACPI_FUNCTION_TRACE(ps_get_next_namepath); |
209 | |
210 | path = acpi_ps_get_next_namestring(parser_state); |
211 | acpi_ps_init_op(op: arg, AML_INT_NAMEPATH_OP); |
212 | |
213 | /* Null path case is allowed, just exit */ |
214 | |
215 | if (!path) { |
216 | arg->common.value.name = path; |
217 | return_ACPI_STATUS(AE_OK); |
218 | } |
219 | |
220 | /* |
221 | * Lookup the name in the internal namespace, starting with the current |
222 | * scope. We don't want to add anything new to the namespace here, |
223 | * however, so we use MODE_EXECUTE. |
224 | * Allow searching of the parent tree, but don't open a new scope - |
225 | * we just want to lookup the object (must be mode EXECUTE to perform |
226 | * the upsearch) |
227 | */ |
228 | status = acpi_ns_lookup(scope_info: walk_state->scope_info, name: path, |
229 | ACPI_TYPE_ANY, interpreter_mode: ACPI_IMODE_EXECUTE, |
230 | ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, |
231 | NULL, ret_node: &node); |
232 | |
233 | /* |
234 | * If this name is a control method invocation, we must |
235 | * setup the method call |
236 | */ |
237 | if (ACPI_SUCCESS(status) && |
238 | possible_method_call && (node->type == ACPI_TYPE_METHOD)) { |
239 | if ((GET_CURRENT_ARG_TYPE(walk_state->arg_types) == |
240 | ARGP_SUPERNAME) |
241 | || (GET_CURRENT_ARG_TYPE(walk_state->arg_types) == |
242 | ARGP_TARGET)) { |
243 | /* |
244 | * acpi_ps_get_next_namestring has increased the AML pointer past |
245 | * the method invocation namestring, so we need to restore the |
246 | * saved AML pointer back to the original method invocation |
247 | * namestring. |
248 | */ |
249 | walk_state->parser_state.aml = start; |
250 | walk_state->arg_count = 1; |
251 | acpi_ps_init_op(op: arg, AML_INT_METHODCALL_OP); |
252 | } |
253 | |
254 | /* This name is actually a control method invocation */ |
255 | |
256 | method_desc = acpi_ns_get_attached_object(node); |
257 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
258 | "Control Method invocation %4.4s - %p Desc %p Path=%p\n" , |
259 | node->name.ascii, node, method_desc, path)); |
260 | |
261 | name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml: start); |
262 | if (!name_op) { |
263 | return_ACPI_STATUS(AE_NO_MEMORY); |
264 | } |
265 | |
266 | /* Change Arg into a METHOD CALL and attach name to it */ |
267 | |
268 | acpi_ps_init_op(op: arg, AML_INT_METHODCALL_OP); |
269 | name_op->common.value.name = path; |
270 | |
271 | /* Point METHODCALL/NAME to the METHOD Node */ |
272 | |
273 | name_op->common.node = node; |
274 | acpi_ps_append_arg(op: arg, arg: name_op); |
275 | |
276 | if (!method_desc) { |
277 | ACPI_ERROR((AE_INFO, |
278 | "Control Method %p has no attached object" , |
279 | node)); |
280 | return_ACPI_STATUS(AE_AML_INTERNAL); |
281 | } |
282 | |
283 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
284 | "Control Method - %p Args %X\n" , |
285 | node, method_desc->method.param_count)); |
286 | |
287 | /* Get the number of arguments to expect */ |
288 | |
289 | walk_state->arg_count = method_desc->method.param_count; |
290 | return_ACPI_STATUS(AE_OK); |
291 | } |
292 | |
293 | /* |
294 | * Special handling if the name was not found during the lookup - |
295 | * some not_found cases are allowed |
296 | */ |
297 | if (status == AE_NOT_FOUND) { |
298 | |
299 | /* 1) not_found is ok during load pass 1/2 (allow forward references) */ |
300 | |
301 | if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) != |
302 | ACPI_PARSE_EXECUTE) { |
303 | status = AE_OK; |
304 | } |
305 | |
306 | /* 2) not_found during a cond_ref_of(x) is ok by definition */ |
307 | |
308 | else if (walk_state->op->common.aml_opcode == |
309 | AML_CONDITIONAL_REF_OF_OP) { |
310 | status = AE_OK; |
311 | } |
312 | |
313 | /* |
314 | * 3) not_found while building a Package is ok at this point, we |
315 | * may flag as an error later if slack mode is not enabled. |
316 | * (Some ASL code depends on allowing this behavior) |
317 | */ |
318 | else if ((arg->common.parent) && |
319 | ((arg->common.parent->common.aml_opcode == |
320 | AML_PACKAGE_OP) |
321 | || (arg->common.parent->common.aml_opcode == |
322 | AML_VARIABLE_PACKAGE_OP))) { |
323 | status = AE_OK; |
324 | } |
325 | } |
326 | |
327 | /* Final exception check (may have been changed from code above) */ |
328 | |
329 | if (ACPI_FAILURE(status)) { |
330 | ACPI_ERROR_NAMESPACE(walk_state->scope_info, path, status); |
331 | |
332 | if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == |
333 | ACPI_PARSE_EXECUTE) { |
334 | |
335 | /* Report a control method execution error */ |
336 | |
337 | status = acpi_ds_method_error(status, walk_state); |
338 | } |
339 | } |
340 | |
341 | /* Save the namepath */ |
342 | |
343 | arg->common.value.name = path; |
344 | return_ACPI_STATUS(status); |
345 | } |
346 | |
347 | /******************************************************************************* |
348 | * |
349 | * FUNCTION: acpi_ps_get_next_simple_arg |
350 | * |
351 | * PARAMETERS: parser_state - Current parser state object |
352 | * arg_type - The argument type (AML_*_ARG) |
353 | * arg - Where the argument is returned |
354 | * |
355 | * RETURN: None |
356 | * |
357 | * DESCRIPTION: Get the next simple argument (constant, string, or namestring) |
358 | * |
359 | ******************************************************************************/ |
360 | |
361 | void |
362 | acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state, |
363 | u32 arg_type, union acpi_parse_object *arg) |
364 | { |
365 | u32 length; |
366 | u16 opcode; |
367 | u8 *aml = parser_state->aml; |
368 | |
369 | ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type); |
370 | |
371 | switch (arg_type) { |
372 | case ARGP_BYTEDATA: |
373 | |
374 | /* Get 1 byte from the AML stream */ |
375 | |
376 | opcode = AML_BYTE_OP; |
377 | arg->common.value.integer = (u64) *aml; |
378 | length = 1; |
379 | break; |
380 | |
381 | case ARGP_WORDDATA: |
382 | |
383 | /* Get 2 bytes from the AML stream */ |
384 | |
385 | opcode = AML_WORD_OP; |
386 | ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml); |
387 | length = 2; |
388 | break; |
389 | |
390 | case ARGP_DWORDDATA: |
391 | |
392 | /* Get 4 bytes from the AML stream */ |
393 | |
394 | opcode = AML_DWORD_OP; |
395 | ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml); |
396 | length = 4; |
397 | break; |
398 | |
399 | case ARGP_QWORDDATA: |
400 | |
401 | /* Get 8 bytes from the AML stream */ |
402 | |
403 | opcode = AML_QWORD_OP; |
404 | ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml); |
405 | length = 8; |
406 | break; |
407 | |
408 | case ARGP_CHARLIST: |
409 | |
410 | /* Get a pointer to the string, point past the string */ |
411 | |
412 | opcode = AML_STRING_OP; |
413 | arg->common.value.string = ACPI_CAST_PTR(char, aml); |
414 | |
415 | /* Find the null terminator */ |
416 | |
417 | length = 0; |
418 | while (aml[length]) { |
419 | length++; |
420 | } |
421 | length++; |
422 | break; |
423 | |
424 | case ARGP_NAME: |
425 | case ARGP_NAMESTRING: |
426 | |
427 | acpi_ps_init_op(op: arg, AML_INT_NAMEPATH_OP); |
428 | arg->common.value.name = |
429 | acpi_ps_get_next_namestring(parser_state); |
430 | return_VOID; |
431 | |
432 | default: |
433 | |
434 | ACPI_ERROR((AE_INFO, "Invalid ArgType 0x%X" , arg_type)); |
435 | return_VOID; |
436 | } |
437 | |
438 | acpi_ps_init_op(op: arg, opcode); |
439 | parser_state->aml += length; |
440 | return_VOID; |
441 | } |
442 | |
443 | /******************************************************************************* |
444 | * |
445 | * FUNCTION: acpi_ps_get_next_field |
446 | * |
447 | * PARAMETERS: parser_state - Current parser state object |
448 | * |
449 | * RETURN: A newly allocated FIELD op |
450 | * |
451 | * DESCRIPTION: Get next field (named_field, reserved_field, or access_field) |
452 | * |
453 | ******************************************************************************/ |
454 | |
455 | static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state |
456 | *parser_state) |
457 | { |
458 | u8 *aml; |
459 | union acpi_parse_object *field; |
460 | union acpi_parse_object *arg = NULL; |
461 | u16 opcode; |
462 | u32 name; |
463 | u8 access_type; |
464 | u8 access_attribute; |
465 | u8 access_length; |
466 | u32 pkg_length; |
467 | u8 *pkg_end; |
468 | u32 buffer_length; |
469 | |
470 | ACPI_FUNCTION_TRACE(ps_get_next_field); |
471 | |
472 | ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); |
473 | aml = parser_state->aml; |
474 | |
475 | /* Determine field type */ |
476 | |
477 | switch (ACPI_GET8(parser_state->aml)) { |
478 | case AML_FIELD_OFFSET_OP: |
479 | |
480 | opcode = AML_INT_RESERVEDFIELD_OP; |
481 | parser_state->aml++; |
482 | break; |
483 | |
484 | case AML_FIELD_ACCESS_OP: |
485 | |
486 | opcode = AML_INT_ACCESSFIELD_OP; |
487 | parser_state->aml++; |
488 | break; |
489 | |
490 | case AML_FIELD_CONNECTION_OP: |
491 | |
492 | opcode = AML_INT_CONNECTION_OP; |
493 | parser_state->aml++; |
494 | break; |
495 | |
496 | case AML_FIELD_EXT_ACCESS_OP: |
497 | |
498 | opcode = AML_INT_EXTACCESSFIELD_OP; |
499 | parser_state->aml++; |
500 | break; |
501 | |
502 | default: |
503 | |
504 | opcode = AML_INT_NAMEDFIELD_OP; |
505 | break; |
506 | } |
507 | |
508 | /* Allocate a new field op */ |
509 | |
510 | field = acpi_ps_alloc_op(opcode, aml); |
511 | if (!field) { |
512 | return_PTR(NULL); |
513 | } |
514 | |
515 | /* Decode the field type */ |
516 | |
517 | ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); |
518 | switch (opcode) { |
519 | case AML_INT_NAMEDFIELD_OP: |
520 | |
521 | /* Get the 4-character name */ |
522 | |
523 | ACPI_MOVE_32_TO_32(&name, parser_state->aml); |
524 | acpi_ps_set_name(op: field, name); |
525 | parser_state->aml += ACPI_NAMESEG_SIZE; |
526 | |
527 | ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); |
528 | |
529 | #ifdef ACPI_ASL_COMPILER |
530 | /* |
531 | * Because the package length isn't represented as a parse tree object, |
532 | * take comments surrounding this and add to the previously created |
533 | * parse node. |
534 | */ |
535 | if (field->common.inline_comment) { |
536 | field->common.name_comment = |
537 | field->common.inline_comment; |
538 | } |
539 | field->common.inline_comment = acpi_gbl_current_inline_comment; |
540 | acpi_gbl_current_inline_comment = NULL; |
541 | #endif |
542 | |
543 | /* Get the length which is encoded as a package length */ |
544 | |
545 | field->common.value.size = |
546 | acpi_ps_get_next_package_length(parser_state); |
547 | break; |
548 | |
549 | case AML_INT_RESERVEDFIELD_OP: |
550 | |
551 | /* Get the length which is encoded as a package length */ |
552 | |
553 | field->common.value.size = |
554 | acpi_ps_get_next_package_length(parser_state); |
555 | break; |
556 | |
557 | case AML_INT_ACCESSFIELD_OP: |
558 | case AML_INT_EXTACCESSFIELD_OP: |
559 | |
560 | /* |
561 | * Get access_type and access_attrib and merge into the field Op |
562 | * access_type is first operand, access_attribute is second. stuff |
563 | * these bytes into the node integer value for convenience. |
564 | */ |
565 | |
566 | /* Get the two bytes (Type/Attribute) */ |
567 | |
568 | access_type = ACPI_GET8(parser_state->aml); |
569 | parser_state->aml++; |
570 | access_attribute = ACPI_GET8(parser_state->aml); |
571 | parser_state->aml++; |
572 | |
573 | field->common.value.integer = (u8)access_type; |
574 | field->common.value.integer |= (u16)(access_attribute << 8); |
575 | |
576 | /* This opcode has a third byte, access_length */ |
577 | |
578 | if (opcode == AML_INT_EXTACCESSFIELD_OP) { |
579 | access_length = ACPI_GET8(parser_state->aml); |
580 | parser_state->aml++; |
581 | |
582 | field->common.value.integer |= |
583 | (u32)(access_length << 16); |
584 | } |
585 | break; |
586 | |
587 | case AML_INT_CONNECTION_OP: |
588 | |
589 | /* |
590 | * Argument for Connection operator can be either a Buffer |
591 | * (resource descriptor), or a name_string. |
592 | */ |
593 | aml = parser_state->aml; |
594 | if (ACPI_GET8(parser_state->aml) == AML_BUFFER_OP) { |
595 | parser_state->aml++; |
596 | |
597 | ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); |
598 | pkg_end = parser_state->aml; |
599 | pkg_length = |
600 | acpi_ps_get_next_package_length(parser_state); |
601 | pkg_end += pkg_length; |
602 | |
603 | ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); |
604 | if (parser_state->aml < pkg_end) { |
605 | |
606 | /* Non-empty list */ |
607 | |
608 | arg = |
609 | acpi_ps_alloc_op(AML_INT_BYTELIST_OP, aml); |
610 | if (!arg) { |
611 | acpi_ps_free_op(op: field); |
612 | return_PTR(NULL); |
613 | } |
614 | |
615 | /* Get the actual buffer length argument */ |
616 | |
617 | opcode = ACPI_GET8(parser_state->aml); |
618 | parser_state->aml++; |
619 | |
620 | ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); |
621 | switch (opcode) { |
622 | case AML_BYTE_OP: /* AML_BYTEDATA_ARG */ |
623 | |
624 | buffer_length = |
625 | ACPI_GET8(parser_state->aml); |
626 | parser_state->aml += 1; |
627 | break; |
628 | |
629 | case AML_WORD_OP: /* AML_WORDDATA_ARG */ |
630 | |
631 | buffer_length = |
632 | ACPI_GET16(parser_state->aml); |
633 | parser_state->aml += 2; |
634 | break; |
635 | |
636 | case AML_DWORD_OP: /* AML_DWORDATA_ARG */ |
637 | |
638 | buffer_length = |
639 | ACPI_GET32(parser_state->aml); |
640 | parser_state->aml += 4; |
641 | break; |
642 | |
643 | default: |
644 | |
645 | buffer_length = 0; |
646 | break; |
647 | } |
648 | |
649 | /* Fill in bytelist data */ |
650 | |
651 | ASL_CV_CAPTURE_COMMENTS_ONLY(parser_state); |
652 | arg->named.value.size = buffer_length; |
653 | arg->named.data = parser_state->aml; |
654 | } |
655 | |
656 | /* Skip to End of byte data */ |
657 | |
658 | parser_state->aml = pkg_end; |
659 | } else { |
660 | arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, aml); |
661 | if (!arg) { |
662 | acpi_ps_free_op(op: field); |
663 | return_PTR(NULL); |
664 | } |
665 | |
666 | /* Get the Namestring argument */ |
667 | |
668 | arg->common.value.name = |
669 | acpi_ps_get_next_namestring(parser_state); |
670 | } |
671 | |
672 | /* Link the buffer/namestring to parent (CONNECTION_OP) */ |
673 | |
674 | acpi_ps_append_arg(op: field, arg); |
675 | break; |
676 | |
677 | default: |
678 | |
679 | /* Opcode was set in previous switch */ |
680 | break; |
681 | } |
682 | |
683 | return_PTR(field); |
684 | } |
685 | |
686 | /******************************************************************************* |
687 | * |
688 | * FUNCTION: acpi_ps_get_next_arg |
689 | * |
690 | * PARAMETERS: walk_state - Current state |
691 | * parser_state - Current parser state object |
692 | * arg_type - The argument type (AML_*_ARG) |
693 | * return_arg - Where the next arg is returned |
694 | * |
695 | * RETURN: Status, and an op object containing the next argument. |
696 | * |
697 | * DESCRIPTION: Get next argument (including complex list arguments that require |
698 | * pushing the parser stack) |
699 | * |
700 | ******************************************************************************/ |
701 | |
702 | acpi_status |
703 | acpi_ps_get_next_arg(struct acpi_walk_state *walk_state, |
704 | struct acpi_parse_state *parser_state, |
705 | u32 arg_type, union acpi_parse_object **return_arg) |
706 | { |
707 | union acpi_parse_object *arg = NULL; |
708 | union acpi_parse_object *prev = NULL; |
709 | union acpi_parse_object *field; |
710 | u32 subop; |
711 | acpi_status status = AE_OK; |
712 | |
713 | ACPI_FUNCTION_TRACE_PTR(ps_get_next_arg, parser_state); |
714 | |
715 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
716 | "Expected argument type ARGP: %s (%2.2X)\n" , |
717 | acpi_ut_get_argument_type_name(arg_type), arg_type)); |
718 | |
719 | switch (arg_type) { |
720 | case ARGP_BYTEDATA: |
721 | case ARGP_WORDDATA: |
722 | case ARGP_DWORDDATA: |
723 | case ARGP_CHARLIST: |
724 | case ARGP_NAME: |
725 | case ARGP_NAMESTRING: |
726 | |
727 | /* Constants, strings, and namestrings are all the same size */ |
728 | |
729 | arg = acpi_ps_alloc_op(AML_BYTE_OP, aml: parser_state->aml); |
730 | if (!arg) { |
731 | return_ACPI_STATUS(AE_NO_MEMORY); |
732 | } |
733 | |
734 | acpi_ps_get_next_simple_arg(parser_state, arg_type, arg); |
735 | break; |
736 | |
737 | case ARGP_PKGLENGTH: |
738 | |
739 | /* Package length, nothing returned */ |
740 | |
741 | parser_state->pkg_end = |
742 | acpi_ps_get_next_package_end(parser_state); |
743 | break; |
744 | |
745 | case ARGP_FIELDLIST: |
746 | |
747 | if (parser_state->aml < parser_state->pkg_end) { |
748 | |
749 | /* Non-empty list */ |
750 | |
751 | while (parser_state->aml < parser_state->pkg_end) { |
752 | field = acpi_ps_get_next_field(parser_state); |
753 | if (!field) { |
754 | return_ACPI_STATUS(AE_NO_MEMORY); |
755 | } |
756 | |
757 | if (prev) { |
758 | prev->common.next = field; |
759 | } else { |
760 | arg = field; |
761 | } |
762 | prev = field; |
763 | } |
764 | |
765 | /* Skip to End of byte data */ |
766 | |
767 | parser_state->aml = parser_state->pkg_end; |
768 | } |
769 | break; |
770 | |
771 | case ARGP_BYTELIST: |
772 | |
773 | if (parser_state->aml < parser_state->pkg_end) { |
774 | |
775 | /* Non-empty list */ |
776 | |
777 | arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP, |
778 | aml: parser_state->aml); |
779 | if (!arg) { |
780 | return_ACPI_STATUS(AE_NO_MEMORY); |
781 | } |
782 | |
783 | /* Fill in bytelist data */ |
784 | |
785 | arg->common.value.size = (u32) |
786 | ACPI_PTR_DIFF(parser_state->pkg_end, |
787 | parser_state->aml); |
788 | arg->named.data = parser_state->aml; |
789 | |
790 | /* Skip to End of byte data */ |
791 | |
792 | parser_state->aml = parser_state->pkg_end; |
793 | } |
794 | break; |
795 | |
796 | case ARGP_SIMPLENAME: |
797 | case ARGP_NAME_OR_REF: |
798 | |
799 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
800 | "**** SimpleName/NameOrRef: %s (%2.2X)\n" , |
801 | acpi_ut_get_argument_type_name(arg_type), |
802 | arg_type)); |
803 | |
804 | subop = acpi_ps_peek_opcode(state: parser_state); |
805 | if (subop == 0 || |
806 | acpi_ps_is_leading_char(c: subop) || |
807 | ACPI_IS_ROOT_PREFIX(subop) || |
808 | ACPI_IS_PARENT_PREFIX(subop)) { |
809 | |
810 | /* null_name or name_string */ |
811 | |
812 | arg = |
813 | acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, |
814 | aml: parser_state->aml); |
815 | if (!arg) { |
816 | return_ACPI_STATUS(AE_NO_MEMORY); |
817 | } |
818 | |
819 | status = |
820 | acpi_ps_get_next_namepath(walk_state, parser_state, |
821 | arg, |
822 | ACPI_NOT_METHOD_CALL); |
823 | } else { |
824 | /* Single complex argument, nothing returned */ |
825 | |
826 | walk_state->arg_count = 1; |
827 | } |
828 | break; |
829 | |
830 | case ARGP_TARGET: |
831 | case ARGP_SUPERNAME: |
832 | |
833 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
834 | "**** Target/Supername: %s (%2.2X)\n" , |
835 | acpi_ut_get_argument_type_name(arg_type), |
836 | arg_type)); |
837 | |
838 | subop = acpi_ps_peek_opcode(state: parser_state); |
839 | if (subop == 0 || |
840 | acpi_ps_is_leading_char(c: subop) || |
841 | ACPI_IS_ROOT_PREFIX(subop) || |
842 | ACPI_IS_PARENT_PREFIX(subop)) { |
843 | |
844 | /* NULL target (zero). Convert to a NULL namepath */ |
845 | |
846 | arg = |
847 | acpi_ps_alloc_op(AML_INT_NAMEPATH_OP, |
848 | aml: parser_state->aml); |
849 | if (!arg) { |
850 | return_ACPI_STATUS(AE_NO_MEMORY); |
851 | } |
852 | |
853 | status = |
854 | acpi_ps_get_next_namepath(walk_state, parser_state, |
855 | arg, |
856 | ACPI_POSSIBLE_METHOD_CALL); |
857 | |
858 | if (arg->common.aml_opcode == AML_INT_METHODCALL_OP) { |
859 | |
860 | /* Free method call op and corresponding namestring sub-ob */ |
861 | |
862 | acpi_ps_free_op(op: arg->common.value.arg); |
863 | acpi_ps_free_op(op: arg); |
864 | arg = NULL; |
865 | walk_state->arg_count = 1; |
866 | } |
867 | } else { |
868 | /* Single complex argument, nothing returned */ |
869 | |
870 | walk_state->arg_count = 1; |
871 | } |
872 | break; |
873 | |
874 | case ARGP_DATAOBJ: |
875 | case ARGP_TERMARG: |
876 | |
877 | ACPI_DEBUG_PRINT((ACPI_DB_PARSE, |
878 | "**** TermArg/DataObj: %s (%2.2X)\n" , |
879 | acpi_ut_get_argument_type_name(arg_type), |
880 | arg_type)); |
881 | |
882 | /* Single complex argument, nothing returned */ |
883 | |
884 | walk_state->arg_count = 1; |
885 | break; |
886 | |
887 | case ARGP_DATAOBJLIST: |
888 | case ARGP_TERMLIST: |
889 | case ARGP_OBJLIST: |
890 | |
891 | if (parser_state->aml < parser_state->pkg_end) { |
892 | |
893 | /* Non-empty list of variable arguments, nothing returned */ |
894 | |
895 | walk_state->arg_count = ACPI_VAR_ARGS; |
896 | } |
897 | break; |
898 | |
899 | default: |
900 | |
901 | ACPI_ERROR((AE_INFO, "Invalid ArgType: 0x%X" , arg_type)); |
902 | status = AE_AML_OPERAND_TYPE; |
903 | break; |
904 | } |
905 | |
906 | *return_arg = arg; |
907 | return_ACPI_STATUS(status); |
908 | } |
909 | |